White Alder grows in the following 6 states and provinces:

Information about White Alder:

The Alnus Rhombifolia is commonly known as the Sierra Alder as well as White Alder.

The currently accepted scientific name for white alder is Alnus
rhombifolia Nutt. . There are no recognized subspecies,
varieties, or forms.

White alder is distributed from the Pacific coast of Baja California,
north in the coastal valleys to just north of San Francisco Bay, in the
interior foothills of the Coast Ranges and low to mid elevation slopes
of the Sierra Nevada. It is found farther north along the lower eastern
slopes of the Cascades in Oregon and Washington and in the dry interior
valleys of Oregon, extending into southern British Columbia. It extends
eastward along the main tributaries of the Columbia River to the lower
valleys of southeastern and south-central Washington, and northeastern
Oregon, reaching its eastern limits in Idaho along the Clearwater and
Snake Rivers .